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Display device and driving method therefor

a technology of a display device and a driving method, which is applied in the direction of static indicating devices, instruments, electroluminescent light sources, etc., can solve the problems of difficult to achieve size increase and definition improvement, difficult to achieve definition improvement, etc., to suppress display unevenness or vertical stripes, low resolution image, and low driving frequency

Active Publication Date: 2019-07-02
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a display device that can reduce power consumption while maintaining image quality. The technical effects of the invention include equalizing the intervals of electro-optical elements in a low resolution mode to suppress display unevenness and vertical stripes, reducing the driving frequency for displaying low resolution images by switching between a high resolution mode and a low resolution mode according to demand, performing pause driving to reduce power consumption of peripheral drivers, and preventing bias in the levels of degradation of transistors and electro-optical elements in each pixel circuit.

Problems solved by technology

An organic EL display device adopting the passive matrix system is simple in structure, but is difficult to achieve size increase and definition improvement.
According to the configuration shown in FIG. 50, since many circuit elements are required within a pixel circuit, it is difficult to achieve definition improvement.

Method used

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  • Display device and driving method therefor
  • Display device and driving method therefor
  • Display device and driving method therefor

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Experimental program
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first embodiment

1. First Embodiment

[0164]

[0165]FIG. 2 is a block diagram showing an overall configuration of an active matrix-type organic EL display device 1 according to a first embodiment of the present invention. The organic EL display device 1 includes a display control circuit 100, a source driver (a data line drive circuit) 200, a gate driver (a scanning signal line drive circuit) 300, first to third emission drivers (first to third light-emission control line drive circuits) 401 to 403, and a display unit 500. The first to third emission drivers 401 to 403 are hereinafter also collectively and simply referred to as “emission driver”. The emission driver is a drive circuit for wiring lines (emission lines which will be described later) for controlling the light emission of organic EL elements provided in the display unit 500. Note that in the present embodiment the gate driver 300 and the first to third emission drivers 401 to 403 are formed in an organic EL panel 7 including the display uni...

second embodiment

2. Second Embodiment

[0241]

[0242]A second embodiment of the present invention will be described. In recent years, in order to realize a reduction in power consumption in a display device, developments have been made in a driving method involving “providing a pause period during which a write operation of image data pauses by bringing all scanning signal lines into a non-scanning state, between a refresh period (a writing period) and a refresh period (a writing period)”. Such a driving is called, for example, “pause driving”. In a display device adopting the pause driving, since it can bring the operation of the peripheral drivers to a halt in the pause period, power consumption can be reduced. Also in the organic EL display device, the pause driving like this is being adopted. Therefore, an organic EL display device adopting the pause driving will be described as a second embodiment of the present invention. Note that an overall configuration (see FIG. 2), an arrangement of pixels (s...

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Abstract

When a display mode is a high-resolution mode, image display is performed by time division driving. When the display mode is a low-resolution mode, image display is performed by defining j pixel circuits arranged continuously in a direction in which scanning signal lines extend as one group, bringing only one organic EL element into a light-emitting state in each of the pixel circuits in a frame period, and bringing organic EL elements having respective light emission colors different from one another into a light-emitting state in the j pixel circuits included in each group in the frame period. Pixel circuits in a display unit are configured such that the intervals of organic EL elements which go into a light-emitting state in the frame period when in the low-resolution mode are equalized regarding a direction in which the scanning signal lines extend.

Description

TECHNICAL FIELD[0001]The present invention relates to a display device and more particularly to a display device including self light-emitting type display elements which are driven by a current, such as an organic EL display device, and a method for driving the display device.BACKGROUND ART[0002]Conventionally, as display elements included in a display device, there are an electro-optical element whose luminance is controlled by a voltage applied thereto, and an electro-optical element whose luminance is controlled by a current flowing therethrough. A representative example of the electro-optical element whose luminance is controlled by a voltage applied thereto includes a liquid crystal display element. On the other hand, a representative example of the electro-optical element whose luminance is controlled by a current flowing therethrough includes an organic EL (Electro Luminescence) element. The organic EL element is also called an OLED (Organic Light-Emitting Diode). An organic...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G09G3/34G09G3/3266H01L27/12H01L27/32H01L51/50G09G3/3233G09G3/3258H05B44/00
CPCG09G3/3258G09G3/3266G09G3/3413H01L27/1225H01L27/3276H01L51/5012G09G3/3233H01L27/3213G09G2300/0814G09G2300/0842G09G2300/0861G09G2310/08G09G2320/0242G09G2340/0407H01L27/3211H10K59/351H10K59/35H10K50/11H10K59/131
Inventor NOGUCHI, NOBORUOHARA, MASANORIKISHI, NORITAKA
Owner SHARP KK
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